Rear Dormer Extensions
Elevate your home, elevate your lifestyle
Top Mark’s Complete Rear Dormer Extension Service
A rear dormer extension is one of the most effective ways to maximise space and add value to your property. At Top Mark Conversions, we specialise in designing and constructing high-quality rear dormer extensions that blend seamlessly with the existing structure while transforming your loft into a bright, functional living area. From start to finish, we ensure a smooth and hassle-free experience. All aspects of the project are covered under our service—including private building control, structural engineer’s calculations, and obtaining the necessary approvals. We coordinate every stage of the process, so you don’t have to worry about dealing with multiple parties.
Whether you're looking to add a new bedroom, office, or family space, we provide a comprehensive, all-in-one solution that takes care of every detail.
Get in touch with us today to start your project with us!



What is a Rear Dormer Extensions?
A rear dormer extension is a popular type of loft conversion designed to create additional headroom and usable space in a property by extending vertically from the rear slope of the roof. This type of extension typically features a flat roof and vertical walls, forming a box-like structure that provides maximum internal volume and a more traditional room shape.
Rear dormers are commonly added to the back of terraced and semi-detached houses, especially in areas with limited space for outward expansion. They are often used to create spacious new bedrooms, offices, or bathrooms in the loft, significantly increasing the home’s livable space and overall value. When constructed by experienced professionals like Top Mark Conversions, a rear dormer extension can be completed efficiently and to a high standard, fully compliant with UK building regulations. It’s a smart, cost-effective way to upgrade your home without moving.
Why choose us?
At Top Mark Conversions, we pride ourselves on delivering high-quality workmanship, honest advice, and a fully managed service from start to finish. With years of experience in loft conversions and rear dormer extensions, we understand what it takes to turn unused attic space into something truly special—whether it’s an extra bedroom, home office, or bathroom.
- Experienced & Skilled Team
- Fully Managed Service
- Transparent Pricing
- High-Quality Workmanship